* Instead of typing four capital letters "HEAD", you can say "@" now,
e.g. "git log @".
However, `git symbolic-ref @` gives "fatal: No such ref: @", while
`git symbolic-ref @` gives "refs/heads/master".
I looked around in the archive and #git, but nobody seemed to be aware
of the behaviour.
I wonder if it's on purpose given the low level of symbolic-ref or if
it's a bug.
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